Verlander is 10-8 with a 3.82 ERA in 28 starts this season. The 34-year-old, who had a had a full no-trade clause in his contract, according to ESPN's Buster Olney, was the 2006 Rookie of the Year and won the Cy Young and MVP awards in 2011.

He spent all 13 years of his career with the Tigers, earning six All-Star appearances.

The Astros, who were rumored to have interest in Verlander at the July trade deadline, have the best record in the American League at 80-53 and hold a 11.5-game lead in the AL West.